in regards to the onboard filters...........like some of the others here, i filter my fuel before going into the fuel container, it has a filtered clunk, it has an automotive filter between the clunk and the pump and it also has a Dubro filter after the pump, i do not draw fuel back out of the plane with this setup so I've eliminated any possibility of debris getting in the fuel system.........................i also use the JetCat filter onboard between the pump and solenoid. i download the ECU to my laptop after every run and i keep track of the maximum fuel pump voltage and when it creeps up to 0.2 volts higher then average i clean the filter and it brings the voltage back to normal values, as the fuel pump brakes in and wears the onboard filter keeps all those fine particles out of the solenoid and the engine.